Collectible Card Game Headquarters

Describe the Bug:
Chainbreaker ability can't be activated even if the requirements are met (untapped, non summoning sickness and mana available)

Which card did behave improperly ?
Chainbreaker

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
2014/05/06: Journey into Nyx

What exactly should be the correct behavior/interaction ?
Chainbreaker ability can be activated if the requirements are met (untapped, non summoning sickness and mana available)

Are any other cards possibly affected by this bug ?
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Pulled from old confirmed :p

This is partly confirmed as Chainbreaker can be activated you pay the mana and it activates goes to stack and (taps) BUT it doesn't then ask you to select target creature to remove a -1/-1 counter.

Fixed in be703f1